How did nuns get politically active in the Middle ages?

I assume you mean in the Middle Ages or Medieval or ( dark) ages, not an age bracket of say fifty-plus. The answer is yes, as the nuns sustained themselves economically in various forms of...

Mainly fruits and vegetables that they grew in their cloister's gardens.

Very simple food. Barley soup and rye bread as well as vegetables and fruit they could grow.

The origin of the Rosary is obscure. It is not mentioned in tne Bible- and is rarely found on Medieval monuments such as tombs of Kings, Queens, and ecclesiatics- one finds statues of Bishops with...

nuns grew crops and prayed 6 hours a day.